In response, the South Korean appliance maker said it was "confident" it would prevail in the dispute. LG's statement added that it was "cooperating fully" with the probe, Reuters reported.

Last month, Whirlpool, the world’s leading home appliance manufacturer, lodged the complaint with the U.S. International Trade Commission in Washington, D.C., alleging that LG infringes on five of its refrigerator patents.